131121123212 has 24 divisors (see below), whose sum is σ = 249330493440. Its totient is φ = 60106456080.

The previous prime is 131121123191. The next prime is 131121123277. The reversal of 131121123212 is 212321121131.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27824708 + ... + 27829419.

It is an arithmetic number, because the mean of its divisors is an integer number (10388770560).

Almost surely, 2^131121123212 is an apocalyptic number.

It is an amenable number.

131121123212 is a deficient number, since it is larger than the sum of its proper divisors (118209370228).

131121123212 is a wasteful number, since it uses less digits than its factorization.

131121123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55654181 (or 55654179 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 131121123212 its reverse (212321121131), we get a palindrome (343442244343).

The spelling of 131121123212 in words is "one hundred thirty-one billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred twelve".